<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert
        show-icon
        title='注意: 只允许为第三级分类设置相关参数！'
        type='warning' :closable='false'>
      </el-alert>
      <el-row class='cat_opt'>
        <el-col>
          <span>选择商品分类:</span>
          <!--         级联选择框-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList" clearable
            :props="cateProps" filterable
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--      tabs区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--        动态参数-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible = true'>添加参数</el-button>
          <!--          动态参数表格-->
          <el-table :data='manyTableData' border stripe>
            <!--            展开行-->
            <el-table-column type='expand' label='More' width='100px'>
              <template slot-scope='scope'>
                <!--                循环渲染tag标签-->
                <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i, scope.row)'>{{ item }}</el-tag>
                <!--                输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--            索引列-->
            <el-table-column type='index' label='#'></el-table-column>
            <el-table-column label='参数名称'  prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button type='primary' size='mini' icon='el-icon-edit' @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
                <el-button type='danger' size='mini' icon='el-icon-delete' @click='removeParams(scope.row.attr_id)'>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--        静态参数-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible = true'>添加属性</el-button>
          <!--          静态参数表格-->
          <el-table :data='onlyTableData' border stripe>
            <!--            展开行-->
              <el-table-column type='expand' label='More' width='100px'>
                <template slot-scope='scope'>
                  <!--                循环渲染tag标签-->
                  <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i, scope.row)'>{{ item }}</el-tag>
                  <!--                输入的文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
            <!--            索引列-->
            <el-table-column type='index' label='#'></el-table-column>
            <el-table-column label='属性名称'  prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button type='primary' size='mini' icon='el-icon-edit' @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
                <el-button type='danger' size='mini' icon='el-icon-delete' @click='removeParams(scope.row.attr_id)'>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--    添加参数的对话框-->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync='addDialogVisible'
      width='50%'
      @close='addFormColsed'>
      <el-form ref='addFormRef' :model='addForm' label-width='80px' :rules='addFormRules'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='addForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
        <el-button @click='addDialogVisible = false'>取 消</el-button>
        <el-button type='primary' @click='addParams'>确 定</el-button>
      </span>
    </el-dialog>
    <!--    修改参数的对话框-->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync='editDialogVisible'
      width='50%'
      @close='editFormColsed'>
      <el-form ref='editFormRef' :model='editForm' label-width='80px' :rules='editFormRules'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='editForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
        <el-button @click='editDialogVisible = false'>取 消</el-button>
        <el-button type='primary' @click='editParams'>确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // tabs标签的值 指定默认被选中的页签
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 添加对话框的显示
      addDialogVisible: false,
      // 预添加的属性
      addForm: {
        attr_name: ''
      },
      // 添加属性的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制编辑对话框的显示
      editDialogVisible: false,
      // 添加属性的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 修改的表单数据
      editForm: {}
    }
  },
  created () {
    // 获取所有商品分类
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取分类信息失败！')
      this.cateList = res.data
    },
    // 级联选择框改变
    handleChange () {
      this.getParamData()
    },
    // tabs标签点击事件
    handleTabClick () {
      this.getParamData()
    },
    // 获取参数的列表数据
    async getParamData () {
      // 判断是否为空
      if (this.selectedCateKeys.length === 0) {
        this.manyTableData = []
        this.onlyTableData = []
        return this.$message.error('请选择三级属性！')
      }
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
      }
      // 根据当前所属的分类和所处的面板取得对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        this.manyTableData = []
        this.onlyTableData = []
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach(item => {
        // 如果不为空，直接分割，为空，返回空数组
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      // 判断数据属于哪个表格
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 添加对话框关闭，重置表单
    addFormColsed () {
      this.$refs.addFormRef.resetFields()
    },
    // 重置编辑对话框的表单
    editFormColsed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(
        async valid => {
          if (valid) {
            const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            })
            if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamData()
          }
        }
      )
    },
    // 显示编辑对话框
    async showEditDialog (Id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${Id}`, {
        attr_sel: this.activeName
      })
      if (res.meta.status !== 200) return this.$message.error('获取数据失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击按钮修改参数信息
    editParams (Id) {
      this.$refs.editFormRef.validate(
        async valid => {
          if (valid) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
              attr_name: this.editForm.attr_name,
              attr_sel: this.activeName
            })
            if (res.meta.status !== 200) return this.$message.error('更新数据失败！')
            this.$message.success('更新数据成功！')
            this.getParamData()
            this.editDialogVisible = false
          }
        }
      )
    },
    // 根据ID删除参数信息
    async removeParams (Id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('删除操作已取消！')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${Id}`)
      if (res.meta.status !== 200) return this.$message.error('删除失败！')
      this.$message.success('参数删除成功！')
      this.getParamData()
    },
    // 文本框失去焦点或者按下enter键触发
    handleInputConfirm (Row) {
      if (Row.inputValue.trim().length !== 0) {
        // 输入正确内容，开始后续处理
        Row.attr_vals.push(Row.inputValue.trim())
        Row.inputValue = ''
        Row.inputVisible = false
        this.saveAttrVals(Row)
      } else {
        Row.inputValue = ''
        Row.inputVisible = false
      }
    },
    // 点击按钮显示文本输入框
    showInput (Row) {
      Row.inputVisible = true
      // 让文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除标签操作
    handleClose (i, Row) {
      Row.attr_vals.splice(i, 1)
      this.saveAttrVals(Row)
    },
    // 对attr_vals的操作
    async saveAttrVals (Row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${Row.attr_id}`, {
        attr_name: Row.attr_name,
        attr_sel: Row.attr_sel,
        attr_vals: Row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('提交数据失败！')
      this.$message.success('编辑参数成功！')
    }
  },
  computed: {
    // 如果按钮需要被禁用 则返回ture 否则 false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }
  }
}
</script>

<style lang='less' scoped>
.cat_opt{
  margin: 15px;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
